XAML, WPF, UWP, silverlight etc etc.
They owned with WinForms back in the day. There was nothing close to market share / productivity for LOB apps. Then it was like they just dynamited repeatedly, and kept on dynamiting?
I can't even imagine the wasted dev cycles, and now the wasted time using janky juddering online apps (even Vax/VMS green screen LOB apps were actually FASTER -> keyboard driven, no lag). If you tracked medical billing from vax/vms days (a fast typist could crank through billing slips and a tech forward clinical staff could checkin a patient and go with a few keyboard keys (including the good old F keys)). Now its wait wait wait, mouse click, mouse move, click, wait type, submit, wait.